 |
|
Riverweed Podostemum ceratophyllum Michx. |
Dicots |  Printer Friendly Version (PDF) |
Family: (Podostemaceae)
State Protection: Threatened 
listed species are those with: 1) 6 to fewer than 20 extant sites, or 2) 1,000 to fewer than 3,000 individuals, or 3) restricted to not less than 4 or more than 7 U.S.G.S. 7 ? minute topographical maps, or 4) listed as threatened by U.S. Department of the Interior. Federal Protection: Not Listed State Rarity Rank: S2
A State Rarity Rank of S2 means: This plant is threatened/imperiled in New York because of rarity (typically 6-20 populations or few remaining individuals) or is vulnerable to extirpation from New York due to biological factors. Global Rarity Rank: G5
A Global Rarity Rank of G5 means: This species is demonstrably secure globally, though it may be quite rare in parts of its range, especially at the periphery. Did you know? This is the only member of this genus and family that occurs in North America. The genus is confined to the New World (Philbrick and Novelo 2004). The genus name Podostemum comes from the greek words for foot and stamen and is in reference to the stamens appearing "raised on a stalk by the side of the ovary" (Fernald 1970). The specific epithet ceratophyllum means horn-leaf (Fernald 1970) and may be in reference to the narrow stiff leaves of this species. |
||||
| State Ranking Justification | [-] |
There are 16 known extant populations and 8 populations which have not been seen in recent years and are considered historical. Many of the populations are clustered along particular rivers. Habitat is somewhat limited for this species but certainly not rare.
| Short-term Trends | [-] |
Fifteen out of the 16 known extant populations have first been documented in the past 30 years. This would seem to point to an increase in this species but since this species is often overlooked, resembles algae, and grows in habitat that make it difficult to detect, it is equally possible that these "new" populations were simply overlooked in the past. Overall, short term trends are not clear but probably are at least stable.
| Long-term Trends | [-] |
No population of this species is known to have become extirpated. Eight populations have not been seen in over 25 years. These populations may still be extant, as targeted surveys at these populations have not been conducted. The habitat for this species may have decreased some in the past 100+ years as rivers and streams were developed and/or polluted. Overall long term trends are not clear.
|
Home | Advanced Search | About Us Animal Guides | Plant Guides | Community Guides © 2004-2012 New York Natural Heritage Program, a partnership between the New York State Department of Environmental Conservation and the State University of New York College of Environmental Science and Forestry Please cite this page as:
New York Natural Heritage Program. 2013. Online Conservation Guide for Podostemum ceratophyllum. Available from: http://www.acris.nynhp.org/guide.php?id=9250. Accessed May 23rd, 2013. 
|